:root {
  --spine-ghost-width: 6px;
  --spine-ghost-gradient: linear-gradient(180deg, #818cf8, #60a5fa 40%, #fde047);
  --spine-ghost-opacity: 0.35;
}
body { background: radial-gradient(circle at 50% 30%, rgba(129,140,248,.12), #020617); }
.spine { left: calc(50% - 14px); }
.spine-ghost { left: calc(50% + 14px); }
.node.section:nth-of-type(odd) { --x: 42%; }
.node.section:nth-of-type(even) { --x: 58%; }
.node.topic[style*="35%"], .node.topic[style*="32%"], .node.topic[style*="38%"] { --x: 32%; }
.node.topic[style*="65%"], .node.topic[style*="68%"], .node.topic[style*="62%"] { --x: 68%; }
.root .orb { border-color: rgba(250,204,21,.75); }
.section .orb { border-color: rgba(129,140,248,.65); }